The universe follows predictable rules, behaving classically according to Einstein’s theory of general relativity. So, what ...

Quantum mechanics has a reputation that precedes it. Virtually everyone who has bumped up against the quantum realm, whether ...

Comparison of the frequencies of distant primary standards calls for the computation of their relativistic rate shift (gravitational+second-order Doppler shift) with an uncertainty lower than that ...

At cosmological scales, Albert Einstein’s theory of general relativity has given scientists an immensely accurate blueprint ...